推特与ACAccountStore (iOS 5)的集成问题

Question

当我用iOS 6.0运行下面的代码时，它工作正常

ACAccountStore *account = [[ACAccountStore alloc] init];
ACAccountType *accountType = [account accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierTwitter];

[account requestAccessToAccountsWithType:accountType options:nil
                                  completion:^(BOOL granted, NSError *error)
     {
         dispatch_async(dispatch_get_main_queue(), ^{

             if (granted) 
             {
                 //MY CODE
             }
         });

     }];

当我用iOS 5.0或5.1运行这段代码时，它崩溃了，输出如下：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', 
reason: '-[ACAccountStore requestAccessToAccountsWithType:options:completion:]: 
unrecognized selector sent to instance 0x68a57c0'

不知道这个奇怪的崩溃日志..

请告诉我，如何摆脱这个..

Answer 1

使用下面的方法：

[account requestAccessToAccountsWithType:accountType withCompletionHandler:^(BOOL granted, NSError *error)
 {

   if (granted) {

            //Your code
            }
        }
   }];

Answer 2

尝试对此进行更新：

ACAccountStore *account = [[ACAccountStore alloc] init];
ACAccountType *accountType = [account accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierTwitter];

// iOS 6
if ( [account respondsToSelector:@selector(requestAccessToAccountsWithType: options: completion:)] )
{
[account requestAccessToAccountsWithType:accountType options:nil
                                  completion:^(BOOL granted, NSError *error)
     {
         dispatch_async(dispatch_get_main_queue(), ^{

             if (granted) 
             {
                 //MY CODE
             }
         });

     }];
}

// iOS 5
else if ( [account respondsToSelector:@selector(requestAccessToAccountsWithType: withCompletionHandler:)] )
{
[account requestAccessToAccountsWithType:accountType
                                  withCompletionHandler:^(BOOL granted, NSError *error)
     {
         dispatch_async(dispatch_get_main_queue(), ^{

             if (granted) 
             {
                 //MY CODE
             }
         });

     }];
}
else
{
// iOS 4 or less
}

Answer 3

这有点晚了，但是你得到这个错误的原因是requestAccessToAccountsWithType:options:completion:是iOS 6中的新特性。

在iOS 5和更早版本中，请改用requestAccessToAccountsWithType:withCompletionHandler方法(在iOS 6中不建议使用此方法)

请参阅文档：https://developer.apple.com/library/ios/documentation/Accounts/Reference/ACAccountStoreClassRef/Reference/Reference.html#//apple_ref/doc/uid/TP40011021-CH1-SW12